Steam-boiler



(NoMoael.) A 2 sheets-sheet 1. G. KINGSLBY.

STEAM BOILER. N0. 390,235. Patented Oct. 2, 1888.

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G. KINGSLEY.

STEAM BOILBR.

Patented 081;. z, 1888.

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outer shell and the brick-work or casing, and

NrTnn STATES PATENT OFFICE.

GEORGE KINGSLEY, OF LOVELL, MASSACHUSETTS.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 390,235I dated October 2I 1888.

Application filed January 19, 188B. Serial No. 261,338. (No model.)

To all whom, it may concern;

Be it known that I, GEORGE KINGsLnY, of Lowell, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in StearhBoilers, of which the following is a specification.

Myinvention is in the nature of certain improvements upon the steam-boiler for which Letters Patent were granted me July 8l, 1883, No. 282,380, and May 10, 1887, No. 362,844; and it consists in the peculiar construction and arrangements of parts which I will now proceed to describe.

Figure l is a vertical longitudinal section; Fig. 2, a vertical transverse section; and Fig. 3 is aside view of one of the side plates of the inner shell.

' In the drawings, A represents the outer shell, and B the inner shell having an arched crown-sheet, with braces extending from the crown-sheet upwardly to the outer shell. The water occupies a position between the outer shell, A, and the inner shell, B, and covers the crownsheet a few inches. The boiler is set with a space, I, on each side between the with aspace, J, beneath the boiler. The spaces I on the sides communicate at the rear end of the boiler with the firechamber, and4 at the front ends these spaces I communicate with the space J under the boiler, the spaces I and J being separated by horizontal partitions H on each side,which extend to within about four i'ect of the front end of the boiler'. The space J under the boiler at its rear end communi- Cates with a chimney or smoke-stack, L. In the space J beneath the boiler is placed a feedwater coil and puriiier, G.

Instead of using drop-tubes descending from the crown-sheet for increasing the steaming capacity, as shown in my previous patents, I construct the side plates of the inner shell, as shown in Fig. 3, with screw-holes a, to receive side tubes, and with alternating rivet-holes b for stay-bolts. Into the screw-holes are turned the tubes C, which are closed at their inner ends and open at their outer ends, so as to com municate with the water-space. These tubes project laterally into the fire-space in an inclined position, being slightly higher at their inner ends. Now, as the products of combustion pass through these tubes they enter the' by pipes P.

The advantages obtained by the inclined side tubes are as follows: First, I get with the same outer dimensions of boiler about twice the amount of heating-surface that I get by drop-tubes from the crownsheet; secondly. the side tubes when inclined, as shown, allow the tubes to empty themselves when the boiler is blown off, thus cleaning themselves; thirdly, there is no chance for dirt or sediment to accumulate in the tubes when the boiler is not in use or lying still, and, fourthly, the crownsheet can be arched and thus made much stronger.

Having thus described my invention, what I claim as new ism The combination, with a double-shell horizontal boiler having an inner and outer respace and a water-space between, of aseries of inclined laterallyprojecting tubes, C, screwed into the inner shell, so as to communicate with the Water-space, and having their inner ends closed and elevated and projecting into the inner lire-space, and thestay-bolts c, alternating with the tubes C and connecting the shells, substantially as shown and described.

GEORGE KINGSLEY.

Witnesses:

J oHN J. PIOKMAN, FRANcIs P. River. 

